1996 Chevy Astro Random Misfire code

Tiny
MIKE00000001
  • MEMBER
  • 1996 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 132,000 MILES
Engine runs rough when it is humid or raining outside. Replaced Cap, Rotor, plugs, wires. Still misfires, runs rough. Looked under the hood when it was wet outside but couldn't see anything wet under there. Otherwise engine runs perfect, starts right away, idles great. Misfires soon as step on gas pedal.
Tired of paying for diagnostic test!
Thanks.
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Monday, March 31st, 2008 AT 12:51 PM

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Tiny
RASMATAZ
  • MEMBER
A Random Misfire P0300 code usually indicates a vacuum leak or bad fuel.

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel
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Monday, March 31st, 2008 AT 12:58 PM

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